With oil still spewing from the well in the Gulf, some people are pushing for natural gas as a cleaner alternative – and Pennsylvania is rich with it. More than three-fourths of the state sits on top of the Marcellus Shale, a geological formation filled with natural gas. But retrieving the gas from the rocky shale has many residents and environmentalists concerned about the health and environmental effects. A recent blowout at a well in Clearfield County sent wastewater and chemicals spraying into the air and there have also been incidents of water contamination. But others say that the economic benefits for the state from taxes and job creation far outweigh those worries. This hour, we’ll debate drilling for natural gas in the Marcellus Shale with Pennsylvania State geologist TERRY ENGELDER and senior attorney wit the Natural Resources Defense Council, KATE SINDING.